安卓开发之自定义下拉刷新头部

一直用的下拉刷新库就是android-Ultra-Pull-to-Refresh，本身这个库就带有几种样式的下拉刷新头部，大家可以去git看一下，地址https://github.com/liaohuqiu/android-Ultra-Pull-To-Refresh。最为方便的是我们可以自己定制各式各样的头部。最近项目有个自定义的下拉头部，自己研究了一下。实现效果是：

开发之自定义下拉刷新头部-安卓自定义下拉刷新">

我们要做的就是自己写一个样式xml文件，然后实现PtrUIHandler这个接口，代码如下：

public class LoadMoreFooterView extends FrameLayout implements PtrUIHandler {
    private LayoutInflater inflater;
 
    // 下拉刷新视图（头部视图）
    private ViewGroup headView;
 
    // 下拉刷新文字
    private TextView tvHeadTitle;
 
    // 下拉图标
    private ImageView ivWindmill;
 
  //  private WindmillDrawable drawable;
 
    public LoadMoreFooterView(Context context) {
        this(context, null);
    }
 
    public LoadMoreFooterView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
 
    public LoadMoreFooterView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context);
    }
 
    /**
     * 初始化
     *
     * @param context
     */
    private void init(Context context) {
 
        inflater = LayoutInflater.from(context);
        /**
         * 头部
         */
        headView = (ViewGroup) inflater.inflate(R.layout.widget_header, this, true);
        ivWindmill = (ImageView) headView.findViewById(R.id.iv_windmill);
        tvHeadTitle = (TextView) headView.findViewById(R.id.tv_head_title);
        ivWindmill.setVisibility(VISIBLE);
        ivWindmill.setImageResource(R.mipmap.icon_logo);
        tvHeadTitle.setText("下拉刷新");
 
    }
 
    @Override
    public void onUIReset(PtrFrameLayout ptrFrameLayout) {
        tvHeadTitle.setText("下拉刷新");
 
    }
 
    @Override
    public void onUIRefreshPrepare(PtrFrameLayout ptrFrameLayout) {
        tvHeadTitle.setText("下拉刷新");
    }
 
    @Override
    public void onUIRefreshBegin(PtrFrameLayout ptrFrameLayout) {
        tvHeadTitle.setText("正在刷新");
 
    }
 
    @Override
    public void onUIRefreshComplete(PtrFrameLayout ptrFrameLayout) {
        ivWindmill.clearAnimation();
        tvHeadTitle.setText("刷新完成");
    }
 
    @Override
    public void onUIPositionChange(PtrFrameLayout frame, boolean isUnderTouch, byte status, PtrIndicator ptrIndicator) {
        final int mOffsetToRefresh = frame.getOffsetToRefresh();
        final int currentPos = ptrIndicator.getCurrentPosY();
        final int lastPos = ptrIndicator.getLastPosY();
 
        if (currentPos < mOffsetToRefresh && lastPos >= mOffsetToRefresh) {
            if (isUnderTouch && status == PtrFrameLayout.PTR_STATUS_PREPARE) {
                tvHeadTitle.setText("下拉刷新");
            }
        } else if (currentPos > mOffsetToRefresh && lastPos <= mOffsetToRefresh) {
            if (isUnderTouch && status == PtrFrameLayout.PTR_STATUS_PREPARE) {
                tvHeadTitle.setText("松开刷新");
            }
        }
 
    }
 
}

使用：

/* 创建自定义刷新头部view */
LoadMoreFooterView header = new LoadMoreFooterView(this);
/* 设置刷新头部view */
ptr_view.setHeaderView(header);
/* 设置回调 */
ptr_view.addPtrUIHandler(header);
ptr_view.setPtrHandler(new PtrHandler() {
    @Override
    public boolean checkCanDoRefresh(PtrFrameLayout frame, View content, View header) {
        return PtrDefaultHandler.checkContentCanBePulledDown(frame, content, header);
    }
 
    @Override
    public void onRefreshBegin(PtrFrameLayout frame) {
        ptr_view.postDelayed(new Runnable() {
            @Override
            public void run() {
              
                getdata();
            }
        }, 2000);
    }
});
    /* 延时100秒,自动刷新 */
ptr_view.postDelayed(new Runnable() {
    @Override
    public void run() {
        ptr_view.autoRefresh();
    }
}, 100);